I am trying to assign the ability to various users to add/remove users from distribution list groups.The distribution groups are in Domain A and the users are in Domain B with two way trust (one forest). Ifthe user is in Domain A (same as the distribution list) I can add them to the exchange recipient adm group and they can use Outlook 2007 - start a new message - right click on a distribution list - select properties -modify members. This works. However, if the user is in domain B this will not work.They get a "do not havesufficient permissions" error message.(Global Catalog read-only for objects). I have tried changing the distribution list security to give them full control. Added the user as "managed by - manager can update list". Added the user to the exchange Organization Adm group and they cannot modify the members of the distribution list as noted above. If I add active directory users andcomputers to a console for themthey can modify members but I would rather not have them accessing users and computers. It looks like AutoDL was used for a way around this up to Exchange 2003.Has anyone tried this with 2007? Has anyone delegated across domains to allow users to modify members? Thank you,

Hello, This happens because outlook uses nearest global catalog (in the same domain) to modify membership of DL of other domain but global catalog doesnt have writable replication part (global catalog contain read-only copy of replica of other domain) so you can not modify the membership. Solution: Move the DL to the domain where owners/managers have their account. OR Point outlook client to user global catalog which is in the same domain where DL is available by changing registry. Reference: You receive an error message when you modify a distribution list in Outlook http://support.microsoft.com/kb/306349